Orange Cake

This entry is an ingredient list with no method attached, and the list itself is incomplete — as printed it will not produce a cake. Read it as a shopping note from a larger sponge-cake formula rather than a set of instructions.

• What is missingSix ounces of flour and five ounces of sugar with only the juice of one orange cannot come together as a batter. Comparable cakes of this period are generally bound with eggs -- whisked whole with the sugar over warm water, or with yolks and whites worked separately -- and some versions add butter. Whatever the exact number, without eggs there is little to bind, aerate or give structure.
• Vienna flourA finely milled, strong Hungarian-style wheat flour sold in Britain from the later nineteenth century, prized for whiteness. Ordinary plain white flour is the sensible substitute; six ounces is about 1 1/3 cups, though these recipes were written for scales and are best weighed.
• Castor sugarCaster sugar, i.e. superfine granulated. Five ounces is roughly 2/3 cup plus a tablespoon. Its fineness matters here: it dissolves into eggs during whisking, where granulated sugar leaves a gritty batter.
• "Rind and juice ... grated"The rind is grated, the juice is not. Take the zest off with a fine grater before cutting the orange, avoiding the white pith, and add the juice last so the acid does not sit on the baking powder any longer than necessary.
• Baking powderOne teaspoon to six ounces of flour is close to a normal modern ratio. Period baking powders were single-acting and of less consistent quality than today's double-acting product, so there is no need to increase the quantity.
• OvenThe printed entry gives no oven, tin or timing. If reconstructing, a cake of this size would suit a moderate oven of about 350F for roughly 25 to 35 minutes in a greased and floured small tin, until the centre springs back -- all of that is modern inference, not the book's instruction.
• YieldNot given. These quantities would suggest one small single-layer cake. If you want a working recipe, take a modern whisked or creamed orange sponge and use these quantities as a cross-check.